public class MathUtil {
    public static int add(int a, int b) {
        return a + b;
    }
    public static int mul(int a, int b) {
        return a * b;}
    public static  int div(int a,int b){
        return a / b;
    }
    public static double sqrt (int a) {

        return Math.sqrt(a);
    }
    public static int square (int a)
    {
        return a*a;

    }
    public static int sub (int a, int b){
        return  a - b;
    }
}

